import Vue from 'vue'
import VueRouter from 'vue-router'

import Login from '../components/Login.vue'
import Home from '../components/Home.vue'


Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  { path: '/home', component: Home }
]

const router = new VueRouter({
  routes
})

// 挂载导航守卫
router.beforeEach((to, from, next) => {
  //to 将要访问的路劲
  // from 代表从那个路劲跳转而来的
  // next 是一个函数，代表放行
  // next() 放行 next('/login') 强制跳转

  if (to.path === '/login') return next()
  //获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
